"The original NES hardware literally only had around 55 colors that were pre-programmed in and no other color was allowed," Wozniak explained. "We broke this rule by adding 5 colors to help with a few things the NES palette lacked—namely, darker and desaturated colors. But we justified that decision by treating it as compensation for the fact that everyone is playing these games on much brighter, higher fidelity screens than the CRTs of the past."
This is a great example of how some retro-style projects get it and some don't. The successful projects are the one that have the feel of the games you used to play in the context of today's gaming, not the ones that do a historically accurate, 1:1 conversion. There's an art to it.